Finding the Fourth Proportional to 12,617.83, 17,385.06 and 8,418.79

Step by Step Solution

1. Step 1: Write the proportion equation
   12,617.83 : 17,385.06 = 8,418.79 : x
2. Step 2: Convert to fraction form
   12,617.83/17,385.06 = 8,418.79/x
3. Step 3: Cross multiply
   12,617.83x = 17,385.06 × 8,418.79
4. Step 4: Simplify right side
   12,617.83x = 146,361,169.28
5. Step 5: Solve for x
   x = 146,361,169.28/12,617.83
6. Step 6: Final answer
   x = 11,599.55